JPH0558107A - Rear axle fastening structure of ungraded ground running vehicle - Google Patents

Abstract

PURPOSE:To reduce the number of parts used and the man-hours for assembly by simultaneously fastening each rear wheel and rear axle using a single nut. CONSTITUTION:A four-wheel ungraded ground running vehicle having wide tires with ultra-low pressure, a handle bar, and a seat of saddle type is equipped with one rear axle 54 supported by the car body frame, a stepped part 54a formed at one side of the rear axle, and a rear axle supporting device 53 having bearing at the ends and supporting the rear axle 54 rotatably, wherein the outer race 56b of one of the bearings 56 is fixed to the rear axle supporting device 53, and the inside of the inner race 56a of the bearing 56 is contacted with the stepped part 54a, and the rear axle is fitted on the rear shaft 54 and fastened with a nut 65 in such a way as contacting the outside of the inner race 56a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has four wide ultra-low pressure tires (balloon tires), a bar handle and a saddle-riding type seat, and is capable of running on rough terrain such as rough roads and wetlands. The present invention relates to a rear wheel shaft tightening structure for a traveling vehicle.

[0002]

2. Description of the Related Art An all-terrain vehicle is provided with one rear wheel shaft without a differential gear. The conventional tightening structure for the rear axle will be described with reference to FIG. Rear axle support device 50
Is configured by integrally connecting the gear case 51, the axle housing 52, and the bearing support member 53, and the rear wheel shaft 5
4 is rotatably supported by a bearing 55 provided on the gear case 51 and a bearing 56 provided on the bearing support member 53. A drive shaft 58, which is rotatably supported by a bearing 57, is arranged in the gear case 51.
The rotation of 8 is transmitted to the rear wheel shaft 54 by the transmission gear 59. Steps 54a, 54b are formed on the rear wheel shaft 54, and double nuts 60, 61 are provided at predetermined positions on the rear wheel shaft 54.
A screw is formed for screwing.

In the above tightening structure, when the rear wheel shaft 54 is inserted into the axle housing 52 from the direction shown by the arrow in the figure, the step portion 54a of the rear wheel shaft 54 eventually comes into contact with the inner race of the bearing 56 and is positioned there. When the double nuts 60 and 61 are tightened in this state, the inner race of the bearing 55 comes into contact with the step portion 54b of the rear wheel shaft 54, and the rear wheel shaft 5
4 is supported by the rear wheel shaft support device 50. Then, the rear wheels are attached to both ends of the rear wheel shaft 54 and fixed with nuts.

[0004]

However, in the above-described conventional tightening structure, since there are separate steps of tightening the rear wheel shaft with the double nut and tightening the rear wheel with another nut, the number of parts and the number of assembly steps are increased. Has the problem of increasing.

The present invention solves the above-mentioned problems, and by simultaneously tightening the rear wheel shaft and the rear wheel with a single nut, the number of parts and the number of assembling steps can be reduced. An object is to provide a wheel shaft tightening structure.

[0006]

To this end, the rear wheel axle tightening structure of the vehicle for traveling on rough terrain according to the present invention has rough four-wheel wide ultra-low pressure tires, a bar handle 10, and a saddle-riding type seat 12 for rough terrain traveling. In a vehicle, one rear wheel shaft 54 supported by a vehicle body frame, a step portion 54a formed on one side of the rear wheel shaft, and bearings 55, 56 at both ends are provided to rotatably support the rear wheel shaft 54. And an outer race 56 b of one of the bearings 56.
The inner race 56a of the bearing 56 is fixed to the step portion 54a.
The rear wheel 31 is fitted to the rear wheel shaft 54 and tightened with a nut 65 so as to abut the inner race 56a. It should be noted that the numbers added to the above configuration are for comparison with the drawings, and the configuration of the present invention is not limited thereby.

[0007]

In the present invention, when the rear wheel shaft 54 is inserted into the gear case 51, the axle housing 52 and the bearing support member 53 from the direction shown by the arrow in FIG.
The step portion 54a of No. 4 comes into contact with the inner side of the inner race 56a of the bearing 56 and is positioned here. In this state, the rear wheel 31 is fitted to the rear wheel shaft 54 and the nut 65 is tightened.
1 contacts the outer side of the inner race 56a via the collar 66, and the rear wheel shaft 54 and the rear wheel 31 can be fixed at the same time.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall side view of an off-road vehicle according to the present invention.

The vehicle body frame includes an upper frame 1 and a lower frame 2 which extend from the front part to the rear part in the left and right directions.
And a connecting frame 3, which connects the upper and lower frames 1 and 2,
4, 5, 6, 7 and front bumper 8 and rear bumper 9
Consists of. Each frame has a bar handle 10, a fuel tank 11, a saddle type seat 12, an engine 13
And the muffler 14 is attached.

A support member 15 is fixed to the front portion of the upper frame 1 between the left and right upper frames 1, and two front shocks 16 are attached to the lower surface of the support member 15 to attach the support member 15 to the front frame. The front fender 17 is fixed to the upper surface. A cover 18 formed integrally with the front fender 17 is attached to the upper frame 1. The lower portions of the left and right front shocks 16 are attached to knuckle arms 23 that support the left and right front wheels 22 via ball joints, and have a well-known strut type independent suspension structure.

A supporting member 25 is fixed to the rear portions of the left and right upper frames 1, and a rear fender 26 is fixed to the upper surface of the supporting member 25. A pivot shaft 30 is provided at a connecting portion between the lower frame 2 and the connecting frames 6 and 7, and a rear arm 32 supporting left and right rear wheels 31 is pivotally supported on the pivot shaft 30. A rear shock 33 is arranged between the rear arm 32 and the upper frame 1. The left and right front wheels 22 and the rear wheels 31 are composed of wide ultra-low pressure tires.

2 and 3 show an embodiment of the rear wheel shaft tightening structure for an all-terrain vehicle according to the present invention. FIG. 2 is an overall sectional view and FIG. 3 is an enlarged sectional view.

In FIG. 2, a rear wheel shaft support device 50 is constructed by integrally connecting a gear case 51, an axle housing 52 and a bearing support member 53, and a rear wheel shaft 54 is
Bearing 55 and bearing support member 5 provided in gear case 51
It is rotatably supported by the bearing 56 provided on the No. 3.
A drive shaft 58 rotatably supported by a bearing 57 is arranged in the gear case 51, and the rotation of the drive shaft 58 is transmitted to the rear wheel shaft 54 by a transmission gear 59. A rear arm 32 is fixed to the gear case 51 and the axle housing 52, and the rear arm 32 is pivotally supported by the pivot shaft 30 shown in FIG. At one end of the rear wheel shaft 54,
The rear wheel 31 is fixed by a nut 62, and the rear wheel 31 and the brake device 63 are provided with a nut 65 at the other end of the rear wheel shaft 54.
Fixed by.

In FIG. 3, a step portion 54a is formed on one side of the rear wheel shaft 54, the inner race 56a of the bearing 56 is brought into contact with the step portion 54a, and a step portion is also provided on the bearing support member 53 side. The outer race 5 of the bearing 56 is formed on this step.
Contact 6b. A collar 66 is arranged between the inner race 56a of the bearing 56 and the brake device 63, and a fixed plate 67 is brought into contact with the outer race 56b, and the fixed plate 67 is fixed to the bearing support member 53 by a bolt 68. Thus, the outer race 56b is fixed to the bearing support member 53.

In the above tightening structure, when the rear wheel shaft 54 is inserted into the gear case 51, the axle housing 52 and the bearing support member 53 from the direction shown by the arrow in the figure, the step portion 54a of the rear wheel shaft 54 eventually becomes the inner race 56 of the bearing 56.
When the rear wheel 31 and the brake device 63 are fitted to the rear wheel shaft 54 and the nut 65 is tightened in this state, the rear wheel 31 and the brake device 63 are brought into contact with the inner side of the a and the inner portion of the rear wheel 31 and the brake device 63 via the collar 66. By contacting the outside of the race 56a, the rear wheel shaft 54 and the rear wheel 31 can be fixed at the same time.

Although the rear wheel shaft support device 50 is attached to the vehicle body frame via the rear arm 32 in the above embodiment, the rear wheel shaft support device 50 may be attached directly to the vehicle body frame.

[0017]

As is apparent from the above description, according to the present invention, the number of parts and the number of assembling steps can be reduced by simultaneously tightening the rear wheel shaft and the rear wheel with one nut.

[Brief description of drawings]

FIG. 1 is an overall side view of an all-terrain vehicle according to the present invention.

FIG. 2 is an overall cross-sectional view showing one embodiment of a rear wheel shaft tightening structure of an off-road vehicle according to the present invention.

FIG. 3 is an enlarged sectional view of FIG.

FIG. 4 is a cross-sectional view showing a conventional rear wheel shaft tightening structure for an all-terrain vehicle.

[Explanation of symbols]

10 ... Bar handle, 12 ... Seat, 31 ... Rear wheel, 50
... rear wheel shaft support device 54 ... rear wheel shaft, 54a ... step portion, 55,
56 ... Bearing, 56a ... Inner race 56b ... Outer race, 65 ... Nut

Claims (1)

[Claims] 1. In an all-terrain vehicle having four wide ultra-low pressure tires, a bar handle and a saddle type seat, one rear wheel shaft supported by a vehicle body frame and one side of the rear wheel shaft. An inner race of the bearing, the outer race of one of the bearings being fixed to the rear wheel shaft support device, and a step portion formed and a rear wheel shaft support device having bearings at both ends to rotatably support the rear wheel shaft. Is abutted on the stepped portion, and the rear wheel is fitted to the rear wheel shaft and is tightened with a nut so as to abut on the inner race.